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ISO7742-Q1: What is the current rating of ESD bypass diode at input pin?

Xing He
Intellectual 2025 points

Hi Rao,

Thanks! 

Another question,   What is the inside diode allowable current?  (In condition voltage of INx is larger than VCCI.) 

Best Regards,

Xing

  • 0
    TI__Mastermind 49495 points

    Hi Xing,

    Applying an input voltage, that is greater than its respective VCC by 0.5V, violates the absolute maximum rating of the device, as stated in datasheet. Hence, TI doesn't guarantee device operation or reliability of device once a device is subjected to such an incident.

    The highlighted diode is designed to bypass an ESD pulse when such a pulse happens to appear at the input pin. The ESD voltage rating that the device supports is listed out in datasheet. Since the diode is not designed to be operated with a continuous current, it doesn't have a continuous current rating defined.

    if customer still likes to have an external series resistor to limit current into device for accidental fault conditions to higher voltages, then I would recommend them to choose the resistor value such that the current through this diode is <1mA to make sure the diode is not stressed out much during such accidentally momentary faults. I hope that answers your question, thanks.


    Regards,
    Koteshwar Rao